CHW-4118 SSOGroupMappingConflict
a mapping for this group value already exists on this provider
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Default message: a mapping for this group value already exists on this provider
HTTP status:409(client)
Problem. The supplied idp_group_value already has a mapping on
this provider. Cause. The database’s unique-constraint on
(provider_id, idp_group_value) fired. Fix. Update the existing
mapping, or pick a different group value. HTTP 409.